Electrified packaging film and manufacturing method thereof

Abstract

Disclosed are a charged packaging film and a method for manufacturing the same, the charged packaging film of the present invention comprising: a film body comprising: a lower layer part comprising a high-density polyethylene, an intrinsic dissipative polymer (IDP) comprising a conductive substance, a modified high-density polyethylene, and a low-melting-point nylon, and a lower layer part comprising a high-density polyethylene, an intrinsic dissipative polymer (IDP) comprising a conductive substance, a modified high-density polyethylene, and a low-melting-point nylon; a middle layer part provided on the upper part of the lower layer part and containing a high-density polyethylene, a linear low-density polyethylene, and a low-density polyethylene; and an upper layer part which is provided on the upper part of the middle layer part and contains a high-density polyethylene, IDP containing a conductive substance, a modified high-density polyethylene, and a low-melting-point nylon. In the embodiment of the invention, the thin film is torn by a method of pulling one part of the tail end of the packaged thin film and easily tearing off and removing along one direction, so that the working process time can be greatly reduced.

Description

Technical Field

[0001] The present invention relates to a thin film, and more particularly, to a charged packaging thin film for packaging electronic products and a method for manufacturing the same. Background Art

[0002] An electronic product manufacturing company produces a TV module (a main body called a module is produced for all TVs or displays in one process and is moved to a place where finished TVs are produced), and transfers it to a TV finished product set (SET) factory. At this time, the following process is performed: the TV module is packaged using a packaging material thin film having a charged property, and a plurality of packaged TV modules are placed in a box and transferred.

[0003] For the packaging material used herein, since it is used for electronic products, in order to prevent static electricity from being generated when packaging or tearing the thin film, it is necessary that the surface of the thin film has a charged property (required to be 1×10 11 Ω or less).

[0004] In addition, this charged property needs to be maintained constantly regardless of time (service life), and under any climatic conditions, there should be no substance flowing out from the surface of the thin film.

[0005] Furthermore, when transferring the packaged packaging thin film, even if surface friction is generated due to shaking, no flaw should be caused on the surface of the module.

[0006] After packaging the TV module using the packaging material having the above characteristics, inserting a plurality of packaged TV modules into a transfer box and transferring them, the packaged thin film is torn in the set factory, and the module is taken out from the transfer box.

[0007] At this time, for the packaged thin film, the upper end portion of the thin film is manually spread one by one, and then the TV module is taken out. This method of manually tearing the thin film requires a large amount of working time, so there is a loss when shortening the process.

[0008] The foregoing technical structure is for helping to understand the background art of the present invention, but it does not mean that it is the prior art well known in the technical field to which the present invention belongs.

[0009] Prior Art Documents

[0010] Patent Documents

[0011] Korean Patent Publication No. 2023 - 0107774 (Fujimori Kogyo Co., Ltd.) on July 18, 2023. Summary of the Invention

[0012] Problems to be Solved by the Invention

[0013] Therefore, the technical problem to be solved by the present invention is to provide a charged packaging film and a manufacturing method thereof, which can significantly reduce the working process time by tearing the film not by expanding the upper end portion of the covering film in a disassembled manner, but by pulling a part of the end of the packaged film and easily tearing it off in one direction.

[0014] Solution to the problem

[0015] According to an aspect of the present invention, there can be provided a charged packaging film, including: a film body, the film body including: a lower layer portion, which contains high-density polyethylene, an inherently dissipative polymer (IDP) containing a conductive substance, modified high-density polyethylene, and low-melting-point nylon; a middle layer portion, which is disposed on the upper part of the lower layer portion and contains the high-density polyethylene, linear low-density polyethylene, and low-density polyethylene; and an upper layer portion, which is disposed on the upper part of the middle layer portion and contains the high-density polyethylene, the IDP containing the conductive substance, the modified high-density polyethylene, and the low-melting-point nylon.

[0016] The lower layer portion contains 30 wt% to 60 wt% of the high-density polyethylene, 15 wt% to 30 wt% of the IDP containing the conductive substance, 10 wt% to 30 wt% of the modified high-density polyethylene, and 5 wt% to 10 wt% of the low-melting-point nylon.

[0017] The modified high-density polyethylene can be made by grafting maleic anhydride onto the high-density polyethylene.

[0018] The maleic anhydride can be grafted at a weight ratio of 0.5% to 2%.

[0019] The middle layer portion contains 10 wt% to 30 wt% of the high-density polyethylene, 30 wt% to 60 wt% of the linear low-density polyethylene, and 10 wt% to 30 wt% of the low-density polyethylene.

[0020] The upper layer portion contains 30 wt% to 60 wt% of the high-density polyethylene, 15 wt% to 30 wt% of the IDP containing the conductive substance, 10 wt% to 30 wt% of the modified high-density polyethylene, and 5 wt% to 10 wt% of the low-melting-point nylon.

[0021] The modified high-density polyethylene can be made by grafting maleic anhydride onto the high-density polyethylene.

[0022] The above-mentioned maleic anhydride can be grafted at a weight ratio of 0.5% to 2%.

[0023] It may further include cutting guide grooves provided on the above-mentioned thin film body.

[0024] It may further include cutting guide bands provided on the above-mentioned thin film body.

[0025] The above-mentioned cutting guide band has a thickness of 50 microns or more and 100 microns or less, and may have a width of 0.5 cm to 1 cm.

[0026] The thickness ratio of the above-mentioned lower layer part, the middle layer part, and the upper layer part may be 1:3:1.

[0027] Moreover, according to another aspect of the present invention, a method for manufacturing a charged packaging film may be provided. The thin film body is formed by laminating a lower layer part, a middle layer part, and an upper layer part. The lower layer part contains high-density polyethylene, IDP containing a conductive substance, modified high-density polyethylene, and low-melting-point nylon. The middle layer part is provided on the upper part of the lower layer part and contains the above-mentioned high-density polyethylene, linear low-density polyethylene, and low-density polyethylene. The upper layer part is provided on the upper part of the middle layer part and contains the above-mentioned high-density polyethylene, the above-mentioned IDP containing a conductive substance, the above-mentioned modified high-density polyethylene, and the above-mentioned low-melting-point nylon.

[0028] It may further include at least one of the following steps: a step of providing cutting guide grooves on the above-mentioned thin film body; and a step of providing cutting guide bands on the above-mentioned thin film body.

[0029] Advantages of the Invention

[0030] In an embodiment of the present invention, the film is torn by pulling a part of the end of the packaged film and easily tearing it off along one direction, so that the working process time can be significantly reduced.

[0031] In addition, by using the cutting guide grooves provided on the thin film body, the cutting part can be easily identified, and the film can be easily cut.

[0032] Furthermore, a cutting reference position can be provided by the cutting guide band, and the film can be easily cut. Brief Description of the Drawings

[0033] Figure 1 It is a diagram schematically showing a charged packaging film according to an embodiment of the present invention.

[0034] Figure 2 It is Figure 1 A schematic cross-sectional view of the thin film body shown in

[0035] Figure 3 As Figure 1The usage state diagram of the charged packaging film shown in [the figure] is a diagram showing the case where the film is torn off in one side direction.

[0036] Figure 4 As the usage state diagram of the existing film, it is a diagram showing the case where the film is unevenly torn off in one side direction.

[0037] Explanation of reference numerals:

[0038] 1: Charged packaging film

[0039] 10: Film body

[0040] 11: Lower layer part

[0041] 12: Middle layer part

[0042] 13: Upper layer part

[0043] 20: Cutting guide groove

[0044] 30: Cutting guide tape. Detailed implementation manners

[0045] In order to fully understand the advantages of the present invention and its operations and the purposes achieved by the embodiments of the present invention, reference should be made to the drawings showing the preferred embodiments of the present invention and the content recorded in the drawings.

[0046] Hereinafter, the preferred embodiments of the present invention will be described with reference to the drawings, so as to explain the present invention in detail. In each drawing, the same reference numerals denote the same components.

[0047] Figure 1 It is a diagram schematically showing a charged packaging film according to an embodiment of the present invention, Figure 2 is Figure 1 a schematic cross-sectional view of the film body shown in [the figure], Figure 3 is Figure 1 a state diagram of the charged packaging film shown in [the figure], Figure 4 is a usage state diagram of the existing film.

[0048] As shown in the figure, the charged packaging film 1 according to this embodiment includes a film body 10, a cutting guide groove 20 provided in the film body 10, and a cutting guide tape 30 provided in the film body 10.

[0049] As Figure 2 shown, the film body 10 includes a lower layer part 11, a middle layer part 12 provided on the upper part of the lower layer part 11, and an upper layer part 13 provided on the upper part of the middle layer part 12.

[0050] The lower layer portion 11 of the thin film body 10 has an electrostatic charge property to prevent static electricity from being generated when packaging electronic products, and may include high-density polyethylene, inherently dissipative polymer (IDP) containing a conductive substance, modified high-density polyethylene, and low-melting-point nylon.

[0051] In this embodiment, the lower layer portion 11 may include 30% to 60% by weight of high-density polyethylene, 15% to 30% by weight of a polyamine-based polymer electrostatic charge polymer, 10% to 30% by weight of modified high-density polyethylene, and 5% to 10% by weight of low-melting-point nylon.

[0052] In this embodiment, for high-density polyethylene, 30% to 60% of the product with a density in the range of 0.940 to 0.960 and a melt index (MI) of 0.1 to 3 under the conditions of 190 °C and 2.16 Kg load can be used. To exhibit the electrostatic charge property, 15% to 30% of IDP containing a conductive substance is used. To increase the compatibility (mixability) of high-density polyethylene and IPD containing a conductive substance and thus well express the electrostatic charge property on the film surface, 10% to 30% of modified high-density polyethylene can be added.

[0053] Specifically, when processing a film made of polyethylene, the film is formed by simultaneously stretching and expanding during film processing. Therefore, the one-dimensional arrangement of the polyethylene structure becomes scattered in the right-angle direction while expanding, making the film stronger. As a result, the final product loses its directionality and cannot be torn along one direction. Such an example is shown in Figure 4 in.

[0054] To further impart directionality to this property, it is necessary to use high-density polyethylene as the basic raw material and add IDP containing a conductive substance for mixed use so that the surface resistivity exhibits an electrostatic charge property. However, IDP containing a conductive substance and polyethylene are polymers with different structures (polyethylene is a non-polar polymer, while IDP containing a conductive substance is a polar polymer). Therefore, it is difficult to achieve mixing. During the mixed melting process, there is no compatibility and they exist independently. Therefore, to increase the mixability of the two and maintain uniform dispersion to well achieve the surface electrostatic charge resistivity, modified high-density polyethylene can be used.

[0055] For the modified high-density polyethylene used herein, a product can be used which is made by grafting about 0.5% to 2% of maleic anhydride (MAH) onto a product having a density of 0.940 to 0.960 and an MI between 3 and 20. That is, in this embodiment, the modified high-density polyethylene can be made in the following manner: in a device with an L / D of 25:1 or more as a twin extruder, in a state where a temperature gradient of 160°C to 230°C is set from the feeding area to the die as the end part of the compressor, a physical property product with an MI between 10 and 30, a density of 0.940 or more and 0.963 or less, and maleic anhydride with a weight ratio of 1% to 3% are mixed, and a raw material with 300 PPM to 800 PPM of peroxide is added to the above mixture and melt-extruded, so that maleic anhydride is grafted onto the high-density polyethylene to be modified to show polar groups.

[0056] In this embodiment, the directionality is also shown to a certain extent and is well mixed with the permanently charged polymer, so that the surface chargeability is also well achieved. At the same time, in order to make the directionality of the formed film prominent and easy to tear, 5% to 10% of a low-melting-point nylon (low-melting-point polyamide) with a melting point lower than 150°C can be added. In this embodiment, for the low-melting-point nylon, a product with a melting point of 90°C to 130°C can be applied. It has a melting point similar to that of polyethylene, and the resin chargeability of the nylon itself is good, so it will not reduce the chargeability of the entire film. When the low-melting-point nylon is used in a proportion of 5% to 10%, the directionality of the expanded polyethylene will be scattered during the film forming process, thus interfering with the phenomenon of blocking the property of tearing along one direction. Therefore, it can play a role in making the finally formed film tear well.

[0057] The middle layer portion 12 of the film body 10 can be made only of polyethylene, so as to maintain the firmness and softness of the film and be easy to process.

[0058] In this embodiment, the middle layer portion 12 is disposed above the lower layer portion 11 and can include high-density polyethylene, linear low-density polyethylene, and low-density polyethylene.

[0059] In this embodiment, the middle layer portion 12 can include 10% to 30% by weight of high-density polyethylene, 30% to 60% by weight of linear low-density polyethylene, and 10% to 30% by weight of low-density polyethylene.

[0060] The upper layer 13 of the thin film body 10 has an electrostatic charge property like the aforementioned lower layer 11 to prevent static electricity from being generated when packaging electronic products, and may contain high-density polyethylene, IDP containing a conductive substance, modified high-density polyethylene, and low-melting-point nylon.

[0061] In this embodiment, the upper layer 13 may contain 30 wt% to 60 wt% of high-density polyethylene, 15 wt% to 30 wt% of IDP containing a conductive substance, 10 wt% to 30 wt% of modified high-density polyethylene, and 5 wt% to 10 wt% of low-melting-point nylon.

[0062] In this embodiment, for the high-density polyethylene, products with a density in the range of 0.940 to 0.960 and a melt index (MI) of 0.1 to 3 under the conditions of 190 °C and a 2.16 Kg load can be used for 30% to 60% of the products. To exhibit the electrostatic charge property, 15% to 30% of IDP containing a conductive substance is used. To increase the compatibility (mixability) of the high-density polyethylene and the IPD containing a conductive substance and thus well express the electrostatic charge property on the film surface, 10% to 30% of modified high-density polyethylene can be added.

[0063] For the modified high-density polyethylene used herein, products can be used which are made by grafting about 0.5% to 2% of maleic anhydride (MAH) onto products with a density of 0.940 to 0.960 and an MI between 3 and 20. That is, in this embodiment, the modified high-density polyethylene can be made in the following manner: in a device with an L / D of 25:1 or more as a twin extruder, in a state where a temperature gradient of 160 °C to 230 °C is set from the feeding area to the die as the end part of the compressor, a physical property product with an MI between 10 and 30, a density of 0.940 or more and 0.963 or less, and maleic anhydride with a weight ratio of 1% to 3% are mixed, and a raw material containing 300 PPM to 800 PPM of peroxide is added to the above mixture and melt-extruded, so that maleic anhydride is grafted onto the high-density polyethylene to be modified to exhibit polar groups.

[0064] This embodiment can directly apply the structure of the low-melting-point nylon of the aforementioned lower layer 11.

[0065] On the other hand, in this embodiment, since three extruders need to be installed to input raw materials into each layer, each extruder is started simultaneously, and it can be formed into a state where the lower layer 11, the middle layer 12, and the upper layer 13 are laminated.

[0066] When tearing off the film body 10, cutting guide grooves 20 can be provided for accuracy, excellence, and standardization.

[0067] In this embodiment, the cutting guide grooves 20 can be provided at the end of the film where tearing starts.

[0068] In this embodiment, the cutting guide grooves 20 can be provided in a "V" - shaped groove form.

[0069] A cutting guide strip 30 can be provided on the film body 10 so that when tearing off the film body 10, it can be torn off quickly and constantly along the tearing direction.

[0070] In this embodiment, the cutting guide strip 30 can be provided by attaching a tape with a thickness of 0.5 cm to 1 cm on the outer surface of the film body 10.

[0071] The manufacturing method of the charged packaging film of this embodiment can include: a step of forming the film body 10 by laminating a lower layer portion 11, a middle layer portion 12, and an upper layer portion 13; a step of providing the cutting guide grooves 20 on the film body 10; and a step of providing the cutting guide strip 30 on the film body 10.

[0072] In this embodiment, the lower layer portion 11 includes the above - mentioned high - density polyethylene, IDP containing a conductive substance, modified high - density polyethylene, and low - melting - point nylon. The middle layer portion 12 is provided above the lower layer portion 11 and includes the above - mentioned high - density polyethylene, linear low - density polyethylene, and low - density polyethylene. The upper layer portion 13 is provided above the middle layer portion 12 and can include the above - mentioned high - density polyethylene, IDP containing a conductive substance, modified high - density polyethylene, and low - melting - point nylon.

[0073] Thus, the present invention is not limited to the described embodiments. It is obvious that various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the present invention. Therefore, such modified examples or variations should fall within the scope of the claims of the present invention.

Claims

1. An electrically charged packaging film, wherein, comprising: a film body, the film body comprising: a lower layer portion containing high density polyethylene, an inherent dissipative polymer containing a conductive substance, modified high density polyethylene, and low melting point nylon; a middle layer portion disposed above the lower layer portion, containing the high density polyethylene, linear low density polyethylene, and low density polyethylene; and an upper layer portion disposed above the middle layer portion, containing the high density polyethylene, the inherent dissipative polymer containing a conductive substance, modified high density polyethylene, and low melting point nylon.

2. The electrically charged packaging film according to claim 1, wherein, the lower layer portion contains 30 wt% to 60 wt% of the high density polyethylene, 15 wt% to 30 wt% of the inherent dissipative polymer containing a conductive substance, 10 wt% to 30 wt% of the modified high density polyethylene, and 5 wt% to 10 wt% of the low melting point nylon.

3. The electrically charged packaging film according to claim 2, wherein, the modified high density polyethylene is made by grafting maleic anhydride onto the high density polyethylene.

4. The electrically charged packaging film according to claim 3, wherein, the maleic anhydride is grafted at a weight ratio of 0.5% to 2%.

5. The electrically charged packaging film according to claim 1, wherein, the middle layer portion contains 10 wt% to 30 wt% of the high density polyethylene, 30 wt% to 60 wt% of the linear low density polyethylene, and 10 wt% to 30 wt% of the low density polyethylene.

6. The electrically charged packaging film according to claim 1, wherein, the upper layer portion contains 30 wt% to 60 wt% of the high density polyethylene, 15 wt% to 30 wt% of the inherent dissipative polymer containing a conductive substance, 10 wt% to 30 wt% of the modified high density polyethylene, and 5 wt% to 10 wt% of the low melting point nylon.

7. The electrically charged packaging film according to claim 6, wherein, the modified high density polyethylene is made by grafting maleic anhydride onto the high density polyethylene.

8. The electrically charged packaging film according to claim 7, wherein, the maleic anhydride is grafted at a weight ratio of 0.5% to 2%.

9. The electrically charged packaging film according to claim 1, wherein, further comprising: a cutting guide groove disposed in the film body.

10. The electrically charged packaging film according to claim 1, wherein, further comprising: a cutting guide strip disposed in the film body.

11. The electrically charged packaging film according to claim 10, wherein, the cutting guide strip has a thickness of 50 microns or more and 100 microns or less, and has a width of 0.5 cm to 1 cm.

12. The electrically charged packaging film according to claim 1, wherein, the thickness ratio of the lower layer portion, the middle layer portion, and the upper layer portion is 1:3:

1.

13. A method for manufacturing an electrically charged packaging film, wherein, A film body is made by laminating a lower layer portion, a middle layer portion, and an upper layer portion. The lower layer portion includes high density polyethylene, an intrinsic dissipative polymer containing a conductive substance, modified high density polyethylene, and low melting point nylon. The middle layer portion is disposed on the upper part of the lower layer portion and includes the high density polyethylene, linear low density polyethylene, and low density polyethylene. The upper layer portion is disposed on the upper part of the middle layer portion and includes the high density polyethylene, the intrinsic dissipative polymer containing a conductive substance, the modified high density polyethylene, and the low melting point nylon.

14. The method for manufacturing an electrified packaging film according to claim 13. Wherein, It includes at least one of the following steps: A step of providing a cutting guide groove in the film body; and A step of providing a cutting guide strip in the film body.

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